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May 9 -- A unit of Warren Buffett’s MidAmerican Energy Holdings Co. plans to invest $1.9 billion to build additional wind farms in Iowa that would increase its wind generating capacity in the state by about half. MidAmerican Energy Co., Iowa’s largest utility, plans to build as much as 1,050 megawatts of new wind power plants in the state, adding to about 2,285 megawatts of projects that it already owns and operates, the Des Moines, Iowa-based company said today in a statement on its website. >>View Article